Located in
model:email.template,subject:account_followup.email_template_account_followup_default
model:email.template,subject:account_followup.email_template_account_followup_level0
model:email.template,subject:account_followup.email_template_account_followup_level1
model:email.template,subject:account_followup.email_template_account_followup_level2